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Quiz Numero siete
| Question | Answer |
|---|---|
| In Mendel’s cross for stem height, what contrasting traits did the pea plants in the P generation exhibit? | Tall and short |
| What trait or traits did the plants in the F1 generation exhibit? | All were tall |
| When you think of the traits of the parent plants, why is this result surprising? | When you think of the traits of the parent plants, why is this result surprising? |
| What is a dominant allele? | An allele in which a trait always shows up when the allele is present. |
| What is a recessive allele? | An allele in which a trait is masked whenever the dominant allele is present. |
| Explain how dominant and recessive alleles for the trait of stem height determine whether a pea plant will be tall or short? | If the plant has two dominant alleles for stem height (TT) then it is tall. If the plant has two recessive alleles for stem height (tt), it is short. If the plant is a hybrid (Tt), it is tall. |
| Can a short pea plant ever be a hybrid for the trait of stem height? Why or why not? As part of your answer, write the letters that represent the alleles for stem height of a short pea plant. | No. A short plant has two recessive alleles (tt); hybrids have two different alleles for a trait (Tt). A hybrid would appear tall because the tall allele is dominant. |
| According to Sutton’s observations, how does the number of chromosomes in a grasshopper’s body cells compare to the number in its sex cells? | Body cells have twice the number of chromosomes (24) as sex cells (12). |
| Describe what happens to the number of chromosomes when two grasshopper sex cells join in fertilization. | The fertilized egg gets 24 chromosomes |
| How do Sutton’s observations about chromosome number support the chromosome theory of inheritance? | Just the offspring get one allele from each parent for every gene; the offspring get half of their chromosomes from one parent and half from the other parent. |
| What is meiosis? | The process by which the number of chromosomes is reduced by half to form sex cells. |
| How is meiosis different than mitosis? | During interphase, the chromosomes DO NOT duplicate. During anaphase, the pair of chromosomes split to make a daughter cell with half the amount of regular chromosomes. |
| Use the events of meiosis to explain why a sex cell normally does not receive both chromosomes from a pair. | In meiosis I, them members of each chromosome pair separate and end up in different cells |
| How are genes arranged on a chromosome? | They are joined like beads on a string |
| How does the order of the genes in one chromosome pair compare to the order of the genes on the other chromosomes? | They are lined up in the same order on both chromosomes. |
| The secret word is monkey - write this word next to the mitosis drawing. You must follow directions in order to earn 2 extra credit points. Do not ask me where to put it the day of the quiz. | The secret word is monkey - write this word next to the mitosis drawing. You must follow directions in order to earn 2 extra credit points. Do not ask me where to put it the day of the quiz. |
Created by:
noahnoahnoah1324